Calculate Variance with Python
Calculating Variance with NumPy
In numpy, pass the sequence of values (such as a column from the dataset) into the np.var() function, for example: np.var(df['work_year']).
Calculating Variance with pandas
In pandas, apply the .var() method directly to the column, like this: df['work_year'].var().
Both methods produce similar results, with slight differences due to the use of different denominators: N in numpy (population variance) and N-1 in pandas (sample variance).
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import pandas as pd
import numpy as np
df = pd.read_csv('https://codefinity-content-media.s3.eu-west-1.amazonaws.com/a849660e-ddfa-4033-80a6-94a1b7772e23/update/ds_salaries_statistics', index_col = 0)
# Calculate the variance using the function from the NumPy library
var_1 = np.var(df['salary_in_usd'])
# Calculate the variance using the function from the pandas library
var_2 = df['salary_in_usd'].var()
print('The variace using NumPy library is', var_1)
print('The variace using pandas library is', var_2)
123456789101112import pandas as pd import numpy as np df = pd.read_csv('https://codefinity-content-media.s3.eu-west-1.amazonaws.com/a849660e-ddfa-4033-80a6-94a1b7772e23/update/ds_salaries_statistics', index_col = 0) # Calculate the variance using the function from the NumPy library var_1 = np.var(df['salary_in_usd']) # Calculate the variance using the function from the pandas library var_2 = df['salary_in_usd'].var() print('The variace using NumPy library is', var_1) print('The variace using pandas library is', var_2)
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